Download Letter Opener for macOS Mail 14.1.3 Free

If you are receiving email from an Outlook user, Mail.app will display its contents as a winmail.dat file attached to the email. letter opener is a simple plug-in that converts data quickly, allowing you to access winmail.dat file contents with a simple double-click.

Fast installation process and simplified interaction

Letter Opener comes with its own installer package that puts everything in place. However, you must restart Mail.app and provide an administrator password to complete the process.

Once installed, the plugin will run in the background without any user interaction. In any case, if you need to update or remove a plugin, the installer also places a Letter Opener entry in the Mail.app main menu: navigate to this area to manage plugins.

Instant conversion and extensive feature set

Every time you receive an email containing a winmail.dat file, just double-click on the item and Letter Opener Pro will take care of the rest: the message content will appear in a new window almost immediately.

In addition to browsing the contents of the winmail.dat file, Letter Opener can also add events to your Calendar.app, create new contacts or read receipts. Additionally, the plugin provides support for nested messages, so you will be able to quickly view the entire communication.

Powerful and discreet Mail.app plugin

Letter Opener is one of the software solutions to a small but annoying problem: the fact that emails received from Outlook users appear as winmail.dat files.

Since interaction with the plugin reverts to a simple double-click every time you want to open an attachment, the process feels very natural.